package icedot.library.common.base;

import icedot.library.common.utils.SysServiceUtils;
import icedot.library.common.utils.struct.StorageInfo;

import java.io.File;
import java.io.FileOutputStream;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.io.Writer;
import java.lang.Thread.UncaughtExceptionHandler;
import java.lang.reflect.Field;
import java.util.HashMap;
import java.util.Map;

import android.content.Context;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.os.Build;
import android.os.Looper;
import android.util.Log;

/**
 * UncaughtException处理类,当程序发生Uncaught异常的时候,有该类来接管程序,并记录发送错误报告.
 * 
 * @author user
 * 
 */
public class CrashHandler implements UncaughtExceptionHandler 
{
    public static final String TAG = "CrashHandler";
 
    //系统默认的UncaughtException处理类 
    protected Thread.UncaughtExceptionHandler _defaultHandler;
    //CrashHandler实例
    protected static CrashHandler INSTANCE = new CrashHandler();
    //程序的Context对象
    protected Context _context;
    //用来存储设备信息和异常信息
    protected Map<String, String> infos = new HashMap<String, String>();
    //错误日志保存的文件
    protected String 			_saveFile;

    /** 保证只有一个CrashHandler实例 */
    protected CrashHandler()
    {
    	_saveFile = "crash.log";
    }

    /** 获取CrashHandler实例 ,单例模式 */
    public static CrashHandler getInstance() 
    {
        return INSTANCE;
    }
    
    public void setFileName(String fileName)
    {
    	_saveFile = fileName;
    }

    /**
     * 初始化
     * 
     * @param context
     */
    public void init(Context context) 
    {
        _context = context;
        //获取系统默认的UncaughtException处理器
        _defaultHandler = Thread.getDefaultUncaughtExceptionHandler();
        //设置该CrashHandler为程序的默认处理器
        Thread.setDefaultUncaughtExceptionHandler(this);
    }

    /**
     * 当UncaughtException发生时会转入该函数来处理
     */
    @Override
    public void uncaughtException(Thread thread, Throwable ex) 
    {
        if (!handleException(ex) && _defaultHandler != null) 
        {
            //如果用户没有处理则让系统默认的异常处理器来处理
            _defaultHandler.uncaughtException(thread, ex);
        } 
        else 
        {
            try 
            {
                Thread.sleep(2000);
            } 
            catch (InterruptedException e) 
            {
                Log.e(TAG, "error : ", e);
            }
            
            _defaultHandler.uncaughtException(thread, ex);
        }
    }

    /**
     * 自定义错误处理,收集错误信息 发送错误报告等操作均在此完成.
     * 
     * @param ex
     * @return true:如果处理了该异常信息;否则返回false.
*/
    protected boolean handleException(Throwable ex)
    {
        if (ex == null) 
        {
            return false;
        }
        //使用Toast来显示异常信息
        new Thread() 
        {
            @Override
            public void run() 
            {
                Looper.prepare();
//                Toast.makeText(mContext, "很抱歉,程序出现异常,即将退出.", Toast.LENGTH_LONG).show();
                Looper.loop();
            }
        }.start();
        //收集设备参数信息 
        collectDeviceInfo(_context);
        //保存日志文件 
        Log.i("liuyou", "ex:"+ex.toString()+"--"+ex.getLocalizedMessage());
        saveCrashInfo2File(ex);
        return true;
    }
    
    /**
     * 收集设备参数信息
     * @param ctx
*/
    public void collectDeviceInfo(Context ctx) 
    {
        try 
        {
            PackageManager pm = ctx.getPackageManager();
            PackageInfo pi = pm.getPackageInfo(ctx.getPackageName(), PackageManager.GET_ACTIVITIES);
            if (pi != null) 
            {
                String versionName = pi.versionName == null ? "null" : pi.versionName;
                String versionCode = pi.versionCode + "";
                infos.put("versionName", versionName);
                infos.put("versionCode", versionCode);
            }
        } 
        catch (NameNotFoundException e) 
        {
            Log.e(TAG, "an error occured when collect package info", e);
        }
        Field[] fields = Build.class.getDeclaredFields();
        for (Field field : fields) 
        {
            try 
            {
                field.setAccessible(true);
                infos.put(field.getName(), field.get(null).toString());
            } 
            catch (Exception e) 
            {
                Log.e(TAG, "an error occured when collect crash info", e);
            }
        }
    }

    /**
     * 保存错误信息到文件中
     * 
     * @param ex
     * @return    返回文件名称,便于将文件传送到服务器
     */
    private String saveCrashInfo2File(Throwable ex) 
    {    
        StringBuffer sb = new StringBuffer();       
        Writer writer = new StringWriter();
        PrintWriter printWriter = new PrintWriter(writer);
        ex.printStackTrace(printWriter);
        Throwable cause = ex.getCause();
        while (cause != null) 
        {
            cause.printStackTrace(printWriter);
            cause = cause.getCause();
        }
        printWriter.close();
        String result = writer.toString();
        sb.append(result);
        try 
        {
//            Calendar cal = Calendar.getInstance();
//            String time = StringUtils.getDateTimeStr(cal);
            
            StorageInfo storage = SysServiceUtils.getStorageInfo(_context);	
        	String path = _context.getCacheDir().getAbsolutePath();
        	if(storage.haveSD())
        	{
        		 path = storage.getSDPath() + "/crash/";
        	}
            else
            {
                path = _context.getFilesDir().getAbsolutePath() + "/crash/";
            }
            File dir = new File(path);
            if (!dir.exists()) 
            {
                dir.mkdirs();
            }
            FileOutputStream fos = new FileOutputStream(path + _saveFile);
            fos.write(sb.toString().getBytes());
            fos.close();
            
            return _saveFile;
        } 
        catch (Exception e) 
        {
            Log.e(TAG, "an error occured while writing file...", e);
        }
        return null;
    }
}